The addition of water vapour does not change the density of:

1. CCl4

2. CS2

3. Ether

4. Coke

Subtopic:  Raoult's Law |
From NCERT
AIPMT - 1998
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NEET 2023 - Target Batch - Aryan Raj Singh
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1 % (w/w) solution of a compound is isotonic with 5 % (w/w) sucrose (sugar) solution. The molecular weight of the compound will be:

1. 32.4 2. 68.4
3. 129.6 4. 34.2
Subtopic:  Osmosis & Osmotic Pressure |
 77%
From NCERT
AIPMT - 1998
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NEET 2023 - Target Batch - Aryan Raj Singh
Hints
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The vapour pressure of a solvent decreased by 10 mm of Hg when a non-volatile solute was added to the solvent. The mole fraction of the solute in solution is 0.2. What would be the mole fraction of the solvent if the decrease in vapour pressure is 20 mm of Hg:
1. 0.2
2. 0.4
3. 0.6
4  0.8

Subtopic:  Relative Lowering of Vapour Pressure |
From NCERT
AIPMT - 1998
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NEET 2023 - Target Batch - Aryan Raj Singh
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From the colligative properties of a solution, which one is the best method for the determination of molecular weight of proteins & polymers:

1. Osmotic pressure

2. Lowering of vapour pressure 

3. Lowering of freezing point

4. Elevation in boiling point

Subtopic:  Osmosis & Osmotic Pressure |
 83%
From NCERT
AIPMT - 2000
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Beans get cooked earlier in a pressure cooker, because:

1. The boiling point increases with increasing pressure
2. The boiling point decreases with increasing pressure
3. The extra pressure of the pressure cooker softens the beans
4. Internal energy is not lost while cooking in a pressure cooker
Subtopic:  Introduction & Colligative properties |
 55%
From NCERT
AIPMT - 2001
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A solution contains a non-volatile solute of molecular mass M2. The molecular mass of solute in terms of osmotic pressure is:
where:

m2 → Mass of solute

V → Volume of solution

\(\pi\) → Osmotic pressure

1. M2=(m2π)VRT

2. M2=(m2V)RTπ

3. M2=(m2V)πRT

4. M2=(m2V)πRT

Subtopic:  Osmosis & Osmotic Pressure |
 79%
From NCERT
AIPMT - 2002
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The ideal solution indicates:

1. A – B attraction force is greater than A – A and B – B.
2. A – B attraction force is less than A – A and B – B.
3. Attraction force remains the same in A – A and B – B.
4. The volume of the solution is different from the sum of the volume of the solute and solvent.
Subtopic:  Raoult's Law |
 85%
From NCERT
AIPMT - 2002
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Camphor is often used in molecular mass determination because:

1. It has a very high cryoscopic constant

2. It is volatile

3. It is a solvent for organic substances

4. It is readily available 

Subtopic:  Introduction & Colligative properties |
AIPMT - 2004
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Hints

The vapour pressure of two liquids 'P' and 'Q' are 80 and 60 torr, respectively. The total vapour pressure of the solution obtained by mixing 3 moles of P and 2 moles of Q would be:

1. 68 torr

2. 140 torr

3. 72 torr

4. 20 torr

Subtopic:  Raoult's Law |
 87%
From NCERT
AIPMT - 2005
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A solution of urea (molar mass 56 g mol–1) boils at 100.18 ºC at atmospheric pressure. If Kf and Kb for water are 1.86 and 0.512 K kg mol–1 respectively, the above solution will freeze at:

1. –6.54 ºC

2. –0.654 ºC

3. 6.54 ºC

4. 0.654 ºC

Subtopic:  Elevation of Boiling Point | Depression of Freezing Point |
 74%
From NCERT
AIPMT - 2005
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